Because it's not a famitracker module. Right next to the button that creates a new instrument is load instrument.
You need to load noise_2.fti once you have selected the N163 expansion.
Which I don't understand. Why disallow future PAL hardware players and expansions? I believe many Hong Kong Famiclones, the Polish Pegasus, and the Russian Dendy were PAL too; which means they could run expanded Famicom games. I do know the PAL frequency tables for expansion chips aren't included as of yet...
Hi there. Can I add an extra noise channel to my track? What I need to do?
Record and save .wavs of all the noise channel instruments you want to have playing at the same time as something else, import them as DPCM samples and play them on the DPCM channel. Also make sure to use Tracker -> Display DPCM State, as the higher the delta channel is the quieter your triangle/noise channels become, and you ought to be aware of this when mixing.
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bite-sized songs inspired by rhythm game music, in Famitracker: http://soundcloud.com/patashu